Unitary electric drive and control unit for film projectors



Dec. 14, 1954 RUHNAU ETAL 2,697,180

UNITARY ELECTRIC DRIVE AND CONTROL UNIT FDR FILM PROJECTORS Filed July50, 1952 2 Sheets-Sheet 1 A76] I5 ,6 j o L; 4 I

II 4 If I; I x r5 r5 q I M 1 I 2 l0 I Dec. 14, 1954 R. RUHNAU ETAL2,697,180

UNITARY ELECTRIC DRIVE AND CONTROL UNIT FOR FILM PROJECTORS Filed July30, 1952 2 Sheets-Sheet 2 o 1/ la Q 9 J Q Mira/r008 E. 1:? LQJZZL 62, to

United States Patent UNITARY ELECTRIC DRIVE AND CONTROL UNIT FOR FILMPROJECTORS Richard Ruhnau, Berlin-Tempelhof, and Erich Weides and GunterEngelage, Langel, near Koln, Germany Application July 30, 1952, SerialNo. 301,712 Claims priority, application Germany August 7, 1951 3Claims. (Cl. 310-66) This invention relates to an arrangement for theelectric drive of cinema projectors, particularly for narrow gauge film.

The drive of the cinema projectors is effected by an a transformer fromalternating cur- Further electric appliances required for on one lateralface a bracket with the current supply plug, the switch and the controlrheostat, and on a second lateral face at a arranged between two supportbolts projecting from the transformer.

In order to tions and the invention,

sound deadening means such as springs, rubber-buffers or bands. Such a2,697,180 Patented Dec. 14, 1954 In the shown of side elevation,respectively.

the coil windings 2 of which are ries the voltage selector 9 11 arrangedon a second face the supply plug 12, the switch stat 1 ly of a singleinsulating pressed piece.

The electric unit requires little space and is particularly suitable forbeing fitted into small portable projectors.

e claim:

carried between said studs.

A unit in accordance with claim 1, in which said devices include acurrent supply plug, a switch and a rheostat mounted upon one other ofsaid support plates.

A unit in accordance with claim 1, including tension springs connectingsaid drive motor to said studs to support the same therebetween.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,162,138 Clark Nov. 30, 1915 2,102,481 Noel Dec. 14, 19372,588,012 Kirkpatrick Mar. 4, 1952 FOREIGN PATENTS Number Country Date616,468 Germany July 29, 1935

